Simplify and cleanup evergreen config
Simplify and cleanup evergreen config

mongodb/mongo-python-driver,ShaneHarvey/mongo-python-driver,aherlihy/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver,ramnes/mongo-python-driver,ramnes/mongo-python-driver,ramnes/mongo-python-driver,ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,aherlihy/mongo-python-driver,aherlihy/mongo-python-driver